Download USBMOD3 User's Manual

USBMOD3 User’s Manual
USBMOD3 - USB Plug and Play Serial Development Module
(Second Generation)
The USBMOD3 shown in Diagram 1, is a second generation, low-cost integrated module
for transferring serial data over USB. Based on the FTDI FT232BM USB UART IC, the
USBMOD3 is capable of transfer rates of up to 1000k baud (RS232) and 3000k baud
(RS422 / RS485).
The USBMOD3 offers a complete plug and play solution making it ideal for rapid
prototyping and development.
Diagram 1
MODULE FEATURES
•
Single module High-Speed USB
UART solution
•
No external passive components
required
•
Module powered from USB bus
in addition to supplying up to
450mA user application
•
Based on the FTDI FT232BM
High-Speed USB UART IC
•
Integrated Type-B USB
Connector
•
On-board 6MHz Crystal
•
32-pin Dual In-Line Package
Ideal for prototyping
•
External EEPROM on board for
USB enumeration data
•
Fits into a standard 32-pin
600mil IC Socket
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USBMOD3 User’s Manual
FT232BM IC FEATURES
•
Single Chip Multi-Function Data
Transfer Solution
•
UHCI / OHCI / EHCI Compliant
•
RS232 link from 300 baud to
1000K baud
•
USB 1.1 and USB 2.0
Compatible
•
RS422/RS485 Link to 3000K
baud
•
USB VID, PID, Serial Number
and Product Description Strings
in external EEPROM.
•
384 byte receive buffer / 128
byte transmit buffer for high data
throughput
VIRTUAL COM PORT (VCP)
DRIVERS for
• Windows 98, 98 SE and ME
• Windows 2000 / XP
• Windows CE **
• MAC OS-8 and OS9
• MAC OS-X **
• Linux 2.40 and greater
•
Full hardware assisted or XOn/X-Off handshaking
•
Support for Event Characters and
Line Break condition
•
Auto Transmit Buffer control for
RS485
[** = In planning or under development]
•
Compact 32 pin (7mm x 7mm)
MQFP package
•
FTD2XX
(USB Direct Drivers + DLL S/W Interface)
• Windows 98, 98 SE and ME
• Windows 2000 / XP
Integrated 6Mhz – 48Mhz Clock
Multiplier aids emissions
compliance
•
Integrated 3.3v Regulator – No
External Regulator Required
ENHANCEMENTS
This section summarises the enhancements of the 2nd generation device compared to its
FT8U232AM predecessor. For further details, consult the device pin-out description and
functional descriptions.
• Integrated Power-On-Reset (POR)
Circuit
The device now incorporates an internal
POR function. The existing RESET# pin
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(RSTI on the module) is maintained in
order to allow external logic to reset the
device where required, however for
many applications, this pin can now be
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USBMOD3 User’s Manual
either left N/C or hard wired to VCC
(+V on the module). In addition, a new
reset output pin (RSTO# or RSTO on the
module) is provided in order to allow the
new POR circuit to provide a stable reset
to external MCU and other devices.
RSTO# was the TEST pin on the
previous generation of devices.
• Integrated RCCLK Circuit
In the previous devices, an external RC
circuit was required to ensure that the
oscillator and clock multiplier PLL
frequency was stable prior to enabling
the clock internal to the device. This
circuit is now embedded on-chip – the
pin assigned to this function is now
designated as the TEST pin and should
be tied to GND for normal operation.
• Integrated Level Converter on
UART interface and control signals
The previous devices would drive the
UART and control signals at 5v CMOS
logic levels. The new device has a
separate VCC-IO (VIO on the module)
pin allowing the device to directly
interface to 3.3v and other logic families
without the need for external level
converter I.C.'s
• Improved Power Management
control for USB Bus Powered, high
current devices
The previous devices had a USBEN pin,
which became active when the device
was enumerated by USB. To provide
power control, this signal had to be
externally gated with SLEEP# and
RESET#. This gating is now done onchip -USBEN has now been replaced
with the new PWREN# signal (/PEN on
the module) which can be used to
directly drive a transistor or P-Channel
MOSFET in applications where power
switching of external circuitry is
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required. A new EEPROM based option
makes the device pull gently down its
UART interface lines when the power is
shut off (PWREN# is High). In this
mode, any residual voltage on external
circuitry is bled to GND when power is
removed thus ensuring that external
circuitry controlled by PWREN# resets
reliably when power is restored.
• Lower Suspend Current
Integration of RCCLK within the device
and internal design improvements reduce
the suspend current of the FT232BM to
under 200uA (excluding the 1.5k pull-up
on USBDP) in USB suspend mode. This
allows greater margin for peripherals to
meet the USB Suspend current limit of
500uA.
• Support for USB Isocronous
Transfers
Whilst USB Bulk transfer is usually the
best choice for data transfer, the
scheduling time of the data is not
guaranteed. For applications where
scheduling latency takes priority over
data integrity such as transferring audio
and low bandwidth video data, the new
device now offers an option of USB
Isocronous transfer via an option bit in
the EEPROM.
• Programmable Receive Buffer
Timeout
In the previous device, the receive buffer
timeout used to flush remaining data
from the receive buffer was fixed at
16ms timeout. This timeout is now
programmable over USB in 1ms
increments from 1ms to 255ms thus
allowing the device to be better
optimised for protocols requiring faster
response times from short data packets.
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USBMOD3 User’s Manual
• TXDEN Timing fix
TXDEN timing has now been fixed to
remove the external delay that was
previously
required
for
RS485
applications at high baud rates. TXDEN
now works correctly during a transmit
send-break condition.
• Relaxed VCC Decoupling
The 2nd generation devices now
incorporate a level of on-chip VCC
decoupling. Though this does not
eliminate the need for external
decoupling capacitors, it significantly
improves the ease of PCB design
requirements to meet FCC, CE and other
EMI related specifications.
• Improved PreScaler Granularity
The previous version of the Prescaler
supported division by (n+0), (n+0.125),
(n+0.25) and (n+0.5) where n is an
integer between 2 and 16,384 (214). To
this we have added (n+0.375),
(n+0.625), (n+0.75) and (n+0.875)
which can be used to improve the
accuracy of some baud rates and
generate new baud rates which were
previously impossible (especially with
higher baud rates).
• Bit Bang Mode
The 2nd generation device has a new
option referred to as “Bit Bang ” mode.
In Bit Bang mode, the eight UART
interface control lines can be switched
between UART interface mode and an 8bit Parallel IO port. Data packets can be
sent to the device and they will be
sequentially sent to the interface at a rate
controlled by the prescaler setting. As
well as allowing the device to be used
stand-alone as a general purpose IO
controller for example controlling lights,
relays and switches, some other
interesting possibilities exist. For
instance, it may be possible to connect
the device to an SRAM configurable
FPGA as supplied by vendors such as
Altera and Xilinx. The FPGA device
would normally be un-configured (i.e.
have no defined function) at power-up.
Application software on the PC could
use Bit Bang Mode to download
configuration data to the FPGA, which
would define its hardware function, then
after the FPGA device is configured the
FT232BM can switch back into UART
interface mode to allow the programmed
FPGA device to communicate with the
PC over USB. This approach allows a
customer to create a “generic ” USB
peripheral who ’s hardware function can
be defined under control of the
application software. The FPGA based
hardware can be easily upgraded or
totally changed simply by changing the
FPGA
configuration
data
file.
Application notes, software and
development
modules
for
this
application area will be available from
FTDI and other 3rd parties.
For further information regarding the FTDI FT232BM USB UART IC please refer to the
FT232BM Datasheet. This datasheet can be found on the Ravar website at
http://www.ravar.net
As mentioned above in module features, the USBMOD3 is in a 32-pin Dual In-Line
Package. This allows the module to fit into a standard 32-pin 600mil IC Socket, which
makes the module ideal for prototyping and development work. Shown in Diagram 2
below is the pin out for the USBMOD3.
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USBMOD3 User’s Manual
USBMOD3 PINOUT
PIN
1
PIN
32
2
31
3
30
4
29
5
28
6
27
7
26
8
25
9
24
10
23
11
22
12
21
13
20
14
19
15
18
16
17
DIAGRAM 2
On the following page is the pin out table showing what the various pins are on the
module.
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USBMOD3 User’s Manual
USBMOD3 PINOUT TABLE
PIN
#
1
2
3
4
5
6
7
8
SIGNAL
TYPE
DESCRIPTION
G
GND
B+
+V
ECS
ECLK
EDAT
RSTI
PWR
PWR
PWR
PWR
I/O
I/O
I/O
IN
9
EP
IN
10
RSTO
OUT
11
3V3
OUT
12
VIO
PWR
13
14
15
16
+V
SLEEP
RXLD
GND
PWR
OUT
O.C.
PWR
Device – Ground Supply Pin
Device – Ground Supply Pin
USB Bus Power
Device - +4.4 volt to +5.25 volt Power Supply Pin
EEPROM – Chip Select
EEPROM – Clock
EEPROM – Data I/O
Can be used by external device to reset chip. If not
required tie to VCC
Enumeration Power connect to RSTO for bus powered
operation or 3V3 to instruct PC to connect to device
Output of the internal Reset Generator. Stays high
impedance for ~2ms after VCC >3.5v and the internal
clock starts up, then clamps it ’s output to the 3.3v output
of the internal regulator. Taking RSTI low will also force
RSTO to go high impedance. RSTO is NOT affected by a
USB Bus Reset.
3.3 volt Output from the integrated L.D.O. regulator. This
pin should be decoupled to GND using a 33nF ceramic
capacitor in close proximity to the device pin. Its prime
purpose is to provide the internal 3.3v supply to the USB
transceiver cell and the RSTO pin. A small amount of
current (<=5mA) can be drawn from this pin to power
external 3.3v logic if required.
+3.0 volt to +5.25 volt VCC to the UART interface pins
10..12,14..16 and 18..25. When interfacing with 3.3v
external logic connect VIO to the 3.3v supply of the
external logic, otherwise connect to +V to drive out at 5v
CMOS level.
Device - +4.4 volt to +5.25 volt Power Supply Pin
Goes Low during USB Suspend Mode
LED Drive – Pulses Low when Receiving Data via USB
Device – Ground Supply Pin
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USBMOD3 User’s Manual
USBMOD3 PINOUT TABLE Continued
PIN
#
17
SIGNAL
TYPE
DESCRIPTION
TXLD
O.C.
18
19
PCTL
/PEN
IN
OUT
20
21
22
23
24
25
26
27
28
29
30
31
32
TXEN
/RI
/DCD
/DSR
/DTR
/CTS
/RTS
RXD
TXD
GND
DD+
G
OUT
IN
IN
IN
OUT
IN
OUT
IN
OUT
PWR
I/O
I/O
PWR
LED Drive – Pulses Low when Transmitting Data via
USB
Bus Powered – Tie Low / Self Powered – Tie High
Goes Low after the device is configured via USB, then
high during USB suspend. Can be used to control power
to external logic using a P-Channel Logic Level
MOSFET Switch. Enable the Interface Pull-Down Option
in EEPROM when using the /PEN pin this way.
UART – Enable Transmit Data for RS485
UART – Ring Indicator Control Input
UART – Data Carrier Detect Control Input
UART – Data Send Ready Control Input
UART – Data Terminal Ready Control Output
UART – Clear To Send Control Input
UART – Request To Send Control Output
UART – Receive Data Input
UART – Transmit Data Output
Device – Ground Supply Pin
USB Data Signal Minus
USB Data Signal Plus
Device – Ground Supply Pin
The following page shows the schematic for the USBMOD3.
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2
16
29
32
1
4
13
21
20
19
28
27
26
25
24
23
22
8
C2
100nF
10nF
C6
+
C4
100nF
VCC
4
16
15
25
24
23
22
21
20
19
18
31
TXEN
/PEN
/DCD
/RI
TXD
RXD
/RTS
/CTS
/DTR
TEST
/RST
VCC
GND
GND
AGND
12
13
VCCIO
3
26
30
VCC
VCC
AVCC
R4
470
USBDP
USBDM
3V3OUT
RSTOUT#
PCTL
SLEEP#
TXLD
RXLD
EESK
EECS
EEDATA
XTIN
XTOUT
U1
FT 232BM
C3
100nF
R2
27R
1K5
C5 33nF
R3
20
C1
10nF
30
3
7
17
15
18
14
10
11
9
31
5
C2
27pF
1
2
3
4
VCC
CON1
USB
+V
DATA+
DATAGND
FB1
Ferrite Bead
R5
2K2
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RA VAR Pty Ltd
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USB MOD3 Schematic
R1
27R
7
8
6
5
14
10
12
11
1
32
2
27
28
R6
X1
6MHz
C3
27pF
MODULE PINS
Ravar Pty Ltd
9
17
29
VCC
6
1
2
3
4
R6
10K
CS
VCC
SK
NC
DIN
NC
DOUT GND
U2
93L C66B
8
7
6
5
VCC
USBMOD3 User’s Manual
USBMOD3 SCHEMATIC
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MODULE PINS
USBMOD3 User’s Manual
Driver Installation
Your first choice when using the USBMOD3 is whether you want to use the Virtual
COM Port driver or the Direct DLL driver.
For programming simplicity, the best driver is the Virtual COM Port and when installed,
the USBMOD3 will appear in the System Properties / Device Manager as an USB Serial
Port (COMn) as follows.
The COM Port number will vary depending on the number of existing COM Ports on
your computer and the number of USBMOD3’s connected to your system.
To install the Virtual COM Port drivers, download the driver from our website and unzip
the files to a local directory. Then connect the USBMOD3 and windows will
automatically ask for the driver, select to specify a location and browse to the directory
where you have unzipped the files. (Use the Non Plug & Play driver for the USBMOD3
to avoid a delay identifying)
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Once the Virtual COM Port is installed it can be programmed exactly as a regular serial
COM port using the MSComm control from Visual Basic or API calls from C or other
languages. Set the COM port to the same number as appears in the Device Manager, the
baud rate, stop bits, parity etc are not used as the device always runs at full speed.
The Direct DLL driver is installed in a similar manner but using the alternative download
from the website.
Programming the Direct DLL driver is by call to the DLL Library functions.
Please download the Direct DLL programmers guide from the Ravar website.
Application Notes
The USBMOD3 is a quick and simple way of changing from existing RS232 to USB.
The existing RS232 interface adaptor can be replaced with a USBMOD3 in a matter of
minutes by connecting TX, RX and handshake lines.
DB 9 Pin
Connector
TX / Handshakes
Connection
to PC via Serial
RX / Handshakes
MAX232
or similar
RS232
Interface
Adaptor
TX / Handshakes
C a n replace the MAX232 or similar
RS232 Interface adaptor with a
USBMOD3
To existing circuitry
RX / Handshakes
Connection
to PC via USB
USBMOD3
On the following pages there are schematic drawings showing various sample
applications for the USBMOD3.
The first application is a USB to RS232 converter, which is capable of achieving a
maximum of 115k baud. The RS232 interface chip that we are using is a MAX213 chip.
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TX D
28
27
26
RI#
DTR #
CTS #
Page 11 of 14
32
2
16
29
1
13
4
19
21
20
25
24
D S R# 23
D CD # 22
RTS #
RX D
8
12
C2
100 nF
1 0nF
C6
+
C4
1 00nF
VC C
4
T XEN
/PEN
/D C D
/RI
T XD
RXD
/RT S
/C TS
/D T R
T EST
/RST
VCC
U SBD P
U SB D M
3V 3O U T
RST O U T #
PC T L
S LE EP#
T XL D
RXL D
EESK
EEC S
EED AT A
XT IN
XT O U T
U1
FT232BM
C3
10 0nF
R1
2 7R
7
8
6
5
14
10
12
11
1
32
2
27
28
R2
27R
1K 5
C 5 33 nF
R6
R3
C2
27 pF
C1
10n F
30
3
7
17 TXLED#
15 R XLED#
18
14
10
11
9
31
5
20
X1
6M H z
C3
27 pF
1
2
3
4
VC C
MODULE PINS
+V
DATA+
DATAGND
6
U2
93LC66B
R6
10K
CS
VCC
SK
NC
DIN
NC
DOUT GND
COPYRIGHT 2002
RAVAR Pty Ltd
www. ravar.net
C ON 1
US B
FB 1
Fe rr ite B ead
R5
2K 2
1
2
3
4
8
7
6
5
To a maximum of 115k baud
USBMOD3 Application Schematic
USB to RS232 Serial Converter
The Outlined Box represents an entire USBMOD3
16
15
25
24
23
22
21
20
19
18
31
R4
47 0
13
VC C IO
3
26
30
VCC
VC C
AVC C
G ND
G ND
AG ND
9
17
29
Ravar Pty Ltd
VCC
C6
0 .1uF
0 .1uF
C5
V CC
S LE E P #
V CC
CT S
DS R
DC D
RX D ATA
RI
TXD
DT R#
RT S #
T X LE D #
TX
V CC
10
12
14
13
25
24
9
4
27
23
18
7
6
20
21
RX LE D#
R1
22 0R
D1
LE D
D2
LE D
G ND
C 1+
C 1-
V+
U2
RI
DTR
CTS
TX D AT A
RTS
RX D ATA
DS R
DCD
VC C
C 2+
C 2-
V-
R1O U T
R2O U T
R3O U T
R4O U T
R5O U T
T 1O U T
T 2O U T
T 3O U T
T 4O U T
M A X 213
releas ed by
M ax im ICs
S H DN#
EN
R 1IN
R 2IN
R 3IN
R 4IN
R 5IN
T 1IN
T 2IN
T 3IN
T 4IN
R2
220 R
RX
VC C
11
15
16
17
8
5
26
22
19
2
3
1
28
S K T1
D B 9M
VC C
Th is is t he m axi mu m
Ba ud ra te w hi ch ca n
be a chi ev ed w ith t his
ch ip
Max Ba ud = 115k
C8
0 .1 uF
C7
0.1uF
CT S #
DS R #
DC D#
RXD
RI#
TX D AT A
DT R
RTS
S HI E LD
5
9
4
8
3
7
2
6
1
10
VC C
USBMOD3 User’s Manual
SAMPLE APPLICATION No. 1
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MODULE PINS
USBMOD3 User’s Manual
Absolute Maximum Ratings
Storage Temperature ……………………………………………..
Ambient Temperature (Power Applied)………………………...
VCC Supply Voltage …………………………………………….
DC Input Voltage - Inputs ……………………………………….
DC Input Voltage - High Impedance Bidirectionals …………….
DC Output Current – Outputs ……………………………………
DC Output Current – Low Impedance Bidirectionals …………...
Power Dissipation ……………………………………………….
-65°C to + 150°C
0°C to + 70°C
-0.5v to +6.00v
-0.5v to VCC + 0.5v
-0.5v to VCC + 0.5v
24mA
24mA
500mW
DC Characteristics (Ambient Temperature = 0°C .. 70°C)
Operating Voltage and Current
Parameter
Vcc1
Vcc2
Icc1
Icc2
Description
+V Operating Supply
Voltage
VIO Operating
Supply Voltage
Operating Supply
Current
Operating Supply
Current
Min
Typ
Max
Units
Conditions
4.4
5.0
5.25
V
3.0
-
5.25
V
-
25
-
mA
Normal Operation
-
180
200
uA
USB Suspend
Units
V
V
V
Conditions
I source = 2 mA
I sink = 4 mA
* Note 1
UART I/O Pin Characteristics (VIO = 5V)
Parameter
Voh
Vol
Vin
VHys
Description
Output Voltage High
Output Voltage Low
Input Switching
Threshold
Input Switching
Hysteresis
Min
4.4
0.1
1.1
Typ
1.5
200
Max
4.9
0.7
1.8
mV
UART I/O Pin Characteristics (VIO = 3.3V)
Parameter
Voh
Vol
Description
Min Typ Max Units
Output Voltage High
2.7
3.2
V
Output Voltage Low
0.1
0.7
V
Input Switching
Vin
1.0
1.4
1.8
V
Threshold
Input Switching
VHys
200
mV
Hysteresis
* Note 1 – Inputs have an internal 200kΩ pull-up resistor to VIO
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Conditions
I source = 2 mA
I sink = 4 mA
* Note 1
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USBMOD3 User’s Manual
RSTI, ECS, EDAT I/O Pin Characteristics
Parameter
Voh
Vol
Vin
VHys
Description
Output Voltage High
Output Voltage Low
Input Switching
Threshold
Input Switching
Hysteresis
Min
4.4
0.1
Typ
-
Max
4.9
0.7
Units
V
V
Conditions
I source = 2 mA
I sink = 4 mA
1.1
1.5
1.8
V
* Note 2
200
mV
* Note 2 – ECS and EDAT pins have an internal 200kΩ pull-up resistor to +V
RSTO Pin Characteristics
Parameter
Voh
Iol
Description
Output Voltage High
Leakage Current TriState
Min
3.0
Typ
-
Max
3.6
Units
V
-
-
5
uA
Conditions
I source = 2 mA
USB I/O Pin Characteristics
Parameter
Description
Min
Typ
Max
Units
UVoh
I/O Pins Static
Output (High)
4.4
-
4.9
V
UVol
I/O Pin Static
Output (Low)
0.1
-
0.7
V
0.8
2.0
V
0.8
2.5
V
UVse
UCom
UVDif
UDrvZ
Single Ended RX
Threshold
Differential
Common Mode
Differential Input
Sensitivity
Driver Output
Impedance
0.2
29
Conditions
Rl = 1.5kÙ to
3V3Out (D+) Rl
= 15kÙ to GND
(D+)
Rl = 1.5kÙ to
3V3Out (D+) Rl
= 15kÙ to GND
(D+)
V
44
Ù (ohm)
* Note 3
* Note 3 – Driver Output Impedance includes the external 27Ù series resistors on D+ and
D- pins.
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USBMOD3 User’s Manual
Technical Support and Further Information
For any questions relating to the USBMOD3 please contact us by Email, Fax or Phone.
Email: [email protected]
Fax: +61 755 914364
Ph: +61 755 325688
Ravar Pty Ltd
5G Jackman Center
Jackman Street, Southport
Queensland 4215
Australia
Ravar Pty Ltd
PO Box 2514
Southport
Queensland 4215
Australia
Product Use Limitations, Warranty and Quality Statement.
The USBMOD3 should not be used in any situation where it’s failure or failure of the PC
or software controlling it could cause human injury or severe damage to equipment.
This device is not designed for or intended to be used in any life critical application.
The USBMOD3 is warranted to be free from manufacture defects for a period of 12
months from the date purchase.
Subjecting the device to conditions beyond the Absolute Maximum Ratings listed above
will invalidate this warranty.
The USBMOD3 is a static sensitive device, anti static procedures should be used in the
handling of this device.
All USBMOD3 units are extensively tested at time of manufacture to be free of defects.
Ravar is committed to providing products of the highest quality. Should you experience
any product quality issues with this product please contact our quality assurance manager
at the above address.
Disclaimer.
This product and its documentation are provided as-is and no warranty is made or implied
as to their suitability for any particular purpose.
Ravar Pty Ltd will not accept any claim for damages arising from the use of this product
or documentation.
This document provides information on our products and all efforts are made to ensure
the accuracy of the information contained within. The specifications of the product are
subject to change and continual improvement.
Ravar Pty Ltd
Version 1.0
Page 14 of 14
http://www.ravar.net